source/graphics/wgl/glcontext.cpp

   1 #include <windows.h>
   2 #include <GL/gl.h>
   3 #include "glcontext.h"
   4 #include "window_private.h"
   5
   6 namespace Msp {
   7 namespace Graphics {
   8
   9 typedef HGLRC ContextHandle;
  10
  11 struct GLContext::Private
  12 {
  13         ContextHandle context;
  14 };
  15
  16
  17 void GLContext::platform_init(const GLOptions &opts)
  18 {
  19         HDC dc = GetDC(window.get_private().window);
  20
  21         PIXELFORMATDESCRIPTOR pfd;
  22         memset(&pfd, 0, sizeof(pfd));
  23
  24         pfd.nSize = sizeof(pfd);
  25         pfd.nVersion = 1;
  26         pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
  27         if(opts.doublebuffer)
  28                 pfd.dwFlags |= PFD_DOUBLEBUFFER;
  29         pfd.iPixelType = PFD_TYPE_RGBA;
  30         if(opts.alpha)
  31                 pfd.cAlphaBits = 1;
  32         pfd.cDepthBits = 1;
  33         if(opts.stencil)
  34                 pfd.cStencilBits = 1;
  35
  36         int pf_index = ChoosePixelFormat(dc, &pfd);
  37         if(!pf_index)
  38                 throw unsupported_gl_mode(opts);
  39         SetPixelFormat(dc, pf_index, &pfd);
  40
  41         priv = new Private;
  42         priv->context = wglCreateContext(dc);
  43         wglMakeCurrent(dc, priv->context);
  44
  45         ReleaseDC(window.get_private().window, dc);
  46 }
  47
  48 GLContext::~GLContext()
  49 {
  50         wglMakeCurrent(0, 0);
  51         wglDeleteContext(priv->context);
  52
  53         delete priv;
  54 }
  55
  56 void GLContext::swap_buffers()
  57 {
  58         HDC dc = GetDC(window.get_private().window);
  59         SwapBuffers(dc);
  60         ReleaseDC(window.get_private().window, dc);
  61 }
  62
  63 void GLContext::window_resized(unsigned w, unsigned h)
  64 {
  65         glViewport(0, 0, w, h);
  66 }
  67
  68 } // namespace Graphics
  69 } // namespace Msp